<?php
/**
 * limit-processor.php
 *
 * This file implements the processor for the LIMIT statements.
 *
 * Copyright (c) 2010-2012, Justin Swanhart
 * with contributions by André Rothe <arothe@phosco.info, phosco@gmx.de>
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */
if (!defined('HAVE_LIMIT_PROCESSOR')) {

    require_once(dirname(__FILE__) . '/abstract-processor.php');

    /**
     * 
     * This class processes the LIMIT statements.
     * 
     * @author arothe
     * 
     */
    class LimitProcessor extends AbstractProcessor {

        public function process($tokens) {
            $rowcount = "";
            $offset = "";

            $comma = -1;
            $exchange = false;

            for ($i = 0; $i < count($tokens); ++$i) {
                $trim = trim($tokens[$i]);
                if ($trim === ",") {
                    $comma = $i;
                    break;
                }
                if ($trim === "OFFSET") {
                    $comma = $i;
                    $exchange = true;
                    break;
                }
            }

            for ($i = 0; $i < $comma; ++$i) {
                if ($exchange) {
                    $rowcount .= $tokens[$i];
                } else {
                    $offset .= $tokens[$i];
                }
            }

            for ($i = $comma + 1; $i < count($tokens); ++$i) {
                if ($exchange) {
                    $offset .= $tokens[$i];
                } else {
                    $rowcount .= $tokens[$i];
                }
            }

            return array('offset' => trim($offset), 'rowcount' => trim($rowcount));
        }
    }

    define('HAVE_LIMIT_PROCESSOR', 1);
}
